Unknown, pain felt near stomach nd chest

My father is aged abt 50 yrs. He smokes and drinks. He has severe pain near chest. When did ecg the report was all normal. Doctor told it's gastric issue but he is taking treatment for gastric related problem still he is feeling the same pain. I seriously don't know whom should I contact. Please Doctor suggest whom should I contact for this related issue. We are financially back. So we were not getting better idea on that. He was under ayurvedic treatment for psoriasis skin disease in between he stopped continued with other treatment. Now his sugar level is also high. I'm completely confused about him. So please help me out to treat him... That will be more thankful. Forgot to mention, two years back he met with an accident he got hurt near his chest so doubt if the pain is related to that. This is kind request to you please let me know what should be done. That will be more helpful. He is the only hope of the family.